I think I’ve found a work around for the M89 audio glitch every 25 seconds or so, at least for VLC:
In Settings | Notifications | VLC – Set “Block all” notifications (Never show notifications from this app).
This alone doesn’t seem to stop the glitches, but displaying the “Equalizer” (access menu dots on top right in VLC) and leaving it on the screen while the audio plays works fine. It isn’t necessary to change anything on the equalizer. I listened to two 22 minute album sides and didn’t notice any glitches.
I haven’t had a chance to experiment with other apps, but considering that videos and streaming video doesn’t glitch having something else grab the screen seemed to do the trick.
…DL